Corrected entry: When Indiana tells the pilot to start the plane the sound the plane makes is the same as the laser sound from Star Wars.
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Correction: The sound effect is not the laser effect, but the hyperdrive malfunctions on the Millennium Falcon. Actually, this is the other way around: The winding -down sounds are actually made by a gear-driven generator found in most older radial aircraft engines. In this particular case, the seaplane was a 1941 Waco UPF-7, and with planes this old there are no buttons to start the engine; you had to wind the starter up with a crank before you could press the button and start the engine. When the starter is engaged it groans a bit, hence the laser-like sound. There are no sound effects here; this is how a genuine Waco UPF-7 sounds when you start it.